The 930, like most gas guns that release the shell from the magazine on bolt cycling, is not 100% reliable with longer magazine tubes. Their operational window is based on 3-4 shells in the tube and shell surge creates reliability issues. Especially with the higher recoiling loads, reliability is marginal at best. They also don't last long term, even if you happen to get one that is reliable initially.

Designs that release the shell on the trigger pull (Stoegers, Benellis, 1301, VersaMax, V3, Affinity, etc.) are what you want if you are going to have shell capacity beyond 3 or 4 rounds in an auto-loader.

The 930, like most gas guns that release the shell from the magazine on bolt cycling, is not 100% reliable with longer magazine tubes. Their operational window is based on 3-4 shells in the tube and shell surge creates reliability issues. Especially with the higher recoiling loads, reliability is marginal at best. They also don't last long term, even if you happen to get one that is reliable initially.

Designs that release the shell on the trigger pull (Stoegers, Benellis, 1301, VersaMax, V3, Affinity, etc.) are what you want if you are going to have shell capacity beyond 3 or 4 rounds in an auto-loader.

I have a Tactical version of the Mossberg 930 SPX with 8 round capacity and once in a while it will double feed and jam up the gun. The length of time to clear it has varied in the 3 or 4 times I remembering it happening but that is significantly longer than the few times clearing my pump shotgun because I short shucked it. I don't know if double feeds happen to every semi-auto shotgun or not but I can attest that it has happened to my 930.

MarkCo and jaguarxk120, do you own a Mossberg 930 or have you spent any significant amount of time shooting one? I own one and have put several thousands rounds through it. It needs a normal amount of cleaning like any gun. Never had a misfire or jam. It is my home defense gun. Mine is a JM version and the cost was only about $50 more. The JM version is the version Jerry Miculek uses for competition. I think Jerry knows if it’s a good/reliable shotgun better tha most folks. Sorry but I trust my experience and Jerry more than ya’ll.

ATN is the one that had issues with a jam. I for one do not own one and chances are
I never will since I do not care for that style of shotgun.
You have a special JM edition gun built differently from the run of the mill or off the shelf
stuff.
Do they work oh yes they do. BUT if I have a misfire on my S&W Model 29 it is just
another pull of the trigger to the next cartridge.
And 240 grains of lead propelled by 21 grains of H-110 makes for a great nightstand gun.

Mossberg builds a good pump action. Every semi-auto they've ever made has had a reputation as less reliable than other brands. The 930 seems to be better than their previous attempts, but not something I'd want to trust with my life.

__________________
"If you're still doing things the same way you were doing them 10 years ago, you're doing it wrong"

But that only works as long as he continues to win. Is he going to take a chance on not winning by using a product that doesn't work as intended?

__________________
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I have /shoot a 930. But, it is the field version with 28" barrel, std magazine. I realize this is different than what has been discussed here, but, it is a very reliable shotgun in the field. I use mine strictly for upland birds and trap now and then. Just thought I'd toss this into the mix.

I don’t have negative feelings towards Mossberg, but feel pretty close to that. They work, but even with what Remington is putting out, you can get further with one if you look it over prior to buying (or have Remington fix any issues that come up).

I’m not a fan of the controls on a Mossberg, especially the safety. With my TAC-14, it would be very awkward with the brace setup (I run it both ways... Shockwave grip would be fine on both). Not really a big deal with the 930, unless you decide on a pistol grip stock, but just my view of Mossberg as a whole.

Actually just sold my last Mossberg (really a Turkish import), which was my trap gun (SRII). Was back to Mossberg twice, but even the 500 JIC2 I had was ROUGH (not a big deal, but the stem of the bead was protruding into the barrel... something you don’t really see with Remington barrels). Have two 11-87s, both of which are my hunting guns. More ideal for me to shoot trap with one of those over a completely different shotgun... especially one that is break-open compared to autoloader.

Gunsmith answer:
#1 to reply to this >>> Its a mossberg. if you want a good shotgun go remington Nope.
I have to fix 870s not too infrequently. I almost never have to fix a Mossberg 500 or then variants of them (different model number)

#2 I have a M500 28" 12 gauge bird gun I converted to an 8 shot model with a heavier duty mag spring, and barrel cut to 22". I did that conversion about 10 years ago. It's never "hick-uped" one time. It's been 100% reliable so far.

So I'd say get one. I would agree with CragWy that you should shoot it quite a lot before you fully trust it, but I will say the same of all guns. If you buy one and get about 8 boxes of high brass "duck-loads" and it goes through all 8 boxes without fail I'd make a guess it will keep going for a lot more.

One more note:
2-3/4" shells have been loaded for over 100 years and with buck shot and with slugs they have been effective on humans and even on large and dangerous animals with a very good track record. They work supper well with success being more common then failure. The use of 3" or even 3.5" does not diminish the lethality of the shell, but I doubt it adds much in home defense situations or even if you had to put down a big bear, but they kick harder, which makes recovery slower, cost more, and reduce the magazine capacity. Stick with the older tried and true 2-3/4" shells

I won't buy a Remington or Mossberg semi-auto. I have owned both and neither really impressed me. Next will be a benelli and if that doean't do the trick I will just give up scatterguns.
Except for my folders.

MarkCo and jaguarxk120, do you own a Mossberg 930 or have you spent any significant amount of time shooting one? I own one and have put several thousands rounds through it. It needs a normal amount of cleaning like any gun. Never had a misfire or jam. It is my home defense gun. Mine is a JM version and the cost was only about $50 more. The JM version is the version Jerry Miculek uses for competition. I think Jerry knows if it’s a good/reliable shotgun better tha most folks. Sorry but I trust my experience and Jerry more than ya’ll.

Yes, I owned one, put about 3K through one. Have fixed a lot of them, but now I won't even work on them. I have designed shotgun configurations for 3 manufacturers, including Remington. Was sponsored by Benelli for a few years, but let that go so I could spent more time working on, and testing different makes.

But that only works as long as he continues to win. Is he going to take a chance on not winning by using a product that doesn't work as intended?

Jerry has, in fact, lost several matches due to his shotgun going down. I am friends with Jerry and I have the utmost respect for him, but it is a money thing for him right now. Jerry is also a master machinist/gunsmith. He takes his allotment and chooses the best, then tinkers with it a good bit. He goes through more than one a season.

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